Revista de Metalurgia, Vol 55, No 3 (2019)

Diseño y caracterización de tres aleaciones multiprincipales ligeras potencialmente candidatas a aleaciones de alta entropía


https://doi.org/10.3989/revmetalm.147

Pablo Pérez
Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC), España
orcid http://orcid.org/0000-0002-4218-2573

Gerardo Garcés
Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC), España
orcid http://orcid.org/0000-0002-6896-7475

Enrique Frutos-Myro
Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC), España
orcid http://orcid.org/0000-0002-3146-2350

Juan M. Antoranz
Universidad Politécnica de Madrid (UPM – ETSIAE), España
orcid http://orcid.org/0000-0002-7982-0188

Sophia Tsipas
Universidad Carlos III de Madrid, España
orcid http://orcid.org/0000-0001-7590-2795

Paloma Adeva
Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC), España
orcid http://orcid.org/0000-0002-9111-8893

Resumen


En este trabajo se estudia la posibilidad de preparar aleaciones de alta entropía del sistema Al-Sc-Ti-V-Cr. Para ello se han seleccionado los elementos y la composición utilizando los criterios conocidos y disponibles en la literatura y se han preparado mediante fusión por arco tres aleaciones con contenidos que varían entre el 10 y 35 at.%. Las tres aleaciones tienen una microestructura dendrítica bifásica similar, siendo las dendritas una solución sólida bcc enriquecida en Ti, V o Cr. El escandio aparece únicamente en el espacio interdendrítico formando el intermetálico Al2Sc. La dureza de las dendritas crece con el contenido en Ti y se hace menor a medida que es mayor el contenido en Cr. Además, la tenacidad de las aleaciones depende de la dureza de las dendritas siendo ésta mayor cuanto más blandas son las dendritas. Los resultados obtenidos demuestran que ni los criterios empíricos utilizados ni los cálculos mediante THERMOCALC permiten predecir la formación de una única solución sólida ni la naturaleza de las fases observadas experimentalmente.

Palabras clave


Alta entropía; Microanálisis; Microestructura; Microscopía; Tenacidad

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Referencias


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